1, 2. pit, hollow, concavity. Hole,cavity,excavation refer to a hollow place in anything. Hole is the common word for this idea: a hole in turf.Cavity is a more formal or scientific term for a hollow within the body or in a substance, whether with or without a passage outward: a cavity in a tooth; the cranial cavity. An excavation is an extended hole made by digging out or removing material: an excavation before the construction of a building.3. den, cave; lair, retreat. 4. hovel, shack.

As a contemptuous word for "small dingy lodging or abode" it is attested from 1610s. Meaning "a fix, scrape, mess" is from 1760. Obscene slang use for "vulva" is implied from mid-14c. Hole in the wall "small and unpretentious place" is from 1822; to hole up first recorded 1875. To need (something) like a hole in the head, applied to something useless or detrimental, first recorded 1944 in entertainment publications, probably a translation of a Yiddish expression, cf. ich darf es vi a loch in kop.

(hōl) A gap, usually the valence band of an insulator or semiconductor, that would normally be filled with one electron. If an electron accelerated by a voltage moves into a gap, it leaves a gap behind it, and in this way the hole itself appears to move through the substance. Even though holes are in fact the absence of a negatively charged particle (an electron), they can be treated theoretically as positively charged particles, whose motion gives rise to electric current.